The half-life of a radioactive sample is 60.0 y. If the sample weighs 0.893 g initially, how much remains after 420.0 y?

Question

Quizplus · Accepted Answer

To find the remaining amount of a radioactive sample after a certain period, you can use the formula: remaining amount = initial amount * (1/2)^(time/half-life). Here, the initial amount is 0.893 g, the time is 420 years, and the half-life is 60 years. So, the calculation is 0.893 * (1/2)^(420/60) = 0.893 * (1/2)^7 = 0.893 * 0.0078125 ≈ 0.00698 g.

The Half-Life of a Radioactive Sample Is 60